AnswersDISD CR Physics 2020-2021Universal Law of Gravitation

Orbital Motion Answers

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1
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Which formula can be used to find the tangential speed of an orbiting object?

A
v =
Option A
B
v =
Option B
C
v = G
Option C
D
v = r
Option D
2
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Sid created a chart to summarize characteristics of satellite motion. Which best describes Sid’s error?

Question illustration
A
Tangential speed changes throughout a satellite’s orbit.
B
Centripetal force is perpendicular to the velocity of the satellite.
C
Tangential speed increases with a satellite’s increasing distance from Earth.
D
Centripetal force can sometimes slow down a satellite in orbit.
3

Which object would be considered to be in free fall?

A
one that experiences both friction and centripetal force
B
one that is truly weightless
C
one that is slowed down by air resistance
D
one with only gravity acting upon it
4

Hannah has information about an object in circular orbit around Earth. mEarth = 6.0 × 1024 kgG = 6.67 × 10–11 rearth=6.0 x 106 m

Question illustration
A
the mass of the orbiting object
B
the distance of the orbiting object to Earth
C
the orbital period of Earth
D
the radius of Earth
5

Which best explains why astronauts appear weightless when they are in a space shuttle orbiting Earth?

A
They are falling toward Earth at the same rate as the space shuttle.
B
They are falling toward Earth at a faster rate than the space shuttle.
C
They are too far from Earth to experience gravity.
D
They are too far from Earth to experience air resistance.
6

A group of scientists is trying to launch an object into orbit, and the object is traveling at 6500 m/s. Which best explains why the object will not successfully orbit Earth?

A
There is not enough air resistance to keep the object moving.
B
There is not enough friction to keep the object moving.
C
The object is not traveling fast enough to match Earth’s curvature.
D
The object is traveling too fast to match Earth’s curvature.
7

Which would cause the greatest increase in the acceleration of a satellite?

A
a decrease in the radius and the tangential speed
B
an increase in the radius and the tangential speed
C
a decrease in the radius and an increase in the tangential speed
D
an increase in the radius and a decrease in the tangential speed
8

The chart shows the speeds at which four objects are launched into the air.

Question illustration
A
W and Y
B
X and Y
C
Y and Z
D
W and Z
9

What is the only force acting on an object orbiting Earth?

A
air resistance
B
friction
C
inertia
D
gravity
10

[BLANK]

A
decreases
B
increases
C
continuously fluctuates
D
stays constant

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